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Search Results: 1 - 10 of 76722 matches for " Jin Y "
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Properties of glucoside 3-dehydrogenase and its potential applications
L Jin, Y Zheng
African Journal of Biotechnology , 2008,
Abstract: Glucoside 3-dehydrogenase, one of the glucose redoxidases, is perhaps known for the vital role it plays in converting a series of sugars to their corresponding 3-ketoglucosides. Glucoside 3-dehydrogenase has attracted considerable attention in recent years due to broad substrate specificity and excellent regioselectivity. Glucoside 3-dehydrogenase is a FAD-enzyme, which is capable of oxidizing glucosides and galactosides to their corresponding 3-ketoglycosides, due to the enzyme’s site-selective oxidation of the C-3 hydroxyl group. These 3-ketoglucosides are useful as building blocks for chemicals such as detergents and polymers. The versatile glucoside 3-dehydrogenase has potential applications in different fields including sugar industry, clinical diagnosis and pharmaceutical intermediates synthesis. This review attempts to describe the glucoside 3-dehydrogenase concerning the sources, properties and applications in detail.
Toxoplasma gondii Inhibits Covalent Modification of Histone H3 at the IL-10 Promoter in Infected Macrophages
Jin Leng,Eric Y. Denkers
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0007589
Abstract: Infection of macrophages with the protozoan parasite Toxoplasma gondii results in inhibition of a large panel of LPS-responsive cytokines, including TNF-α, while leaving others such as IL-10 intact. Recent studies provide evidence that the parasite interferes with chromatin remodeling at the TNF-α promoter that is normally associated with LPS stimulation, but that is not required for TLR4 induction of IL-10. Here, we examined the effect of Toxoplasma on IL-10 induced by simultaneous signaling through TLR4 and FcγR, a combined stimulus that triggers histone H3 covalent modification at the IL-10 promoter resulting in high level IL-10 cytokine production. We show that the parasite inhibits high level IL-10 production and prevents histone H3 Ser10 phosphorylation and Lys9/14 acetylation at the IL-10 promoter. These results provide compelling evidence that T. gondii targets the host cell chromatin remodeling machinery to down-regulate cytokine responses in infected macrophages.
Determination of the Shear Buckling Load of a Large Polymer Composite I-Section Using Strain and Displacement Sensors
Jin Y. Park,Jeong Wan Lee
Sensors , 2012, DOI: 10.3390/s121216024
Abstract: This paper presents a method and procedure of sensing and determining critical shear buckling load and corresponding deformations of a comparably large composite I-section using strain rosettes and displacement sensors. The tested specimen was a pultruded composite beam made of vinyl ester resin, E-glass and carbon fibers. Various coupon tests were performed before the shear buckling test to obtain fundamental material properties of the I-section. In order to sensitively detect shear buckling of the tested I-section, twenty strain rosettes and eight displacement sensors were applied and attached on the web and flange surfaces. An asymmetric four-point bending loading scheme was utilized for the test. The loading scheme resulted a high shear and almost zero moment condition at the center of the web panel. The web shear buckling load was determined after analyzing the obtained test data from strain rosettes and displacement sensors. Finite element analysis was also performed to verify the experimental results and to support the discussed experimental approach.
Endoscopic Ultrasonography of the Pancreas: New Advances
Hayakawa T,Jin C X,Hirooka Y
JOP Journal of the Pancreas , 2000,
Abstract:
Camera Control and Multimedia Interaction using Individual Object Recognition
Richard Y. D. Xu,Jesse S. Jin
Journal of Multimedia , 2007, DOI: 10.4304/jmm.2.3.77-85
Abstract: Currently, most of the automated, computer vision assisted camera control policies are based on human events, such as the speaker gesture and position changes. In addition to these events, in this paper, we introduce a set of natural camera control and multimedia synchronization schemes based on the individual object interaction. We describe in detail, how our unique method, in which the head-pose estimation are used to compute the region of interest (ROI) for recognizing the hand-held object. We explain, from our results, how our approach has achieved robustness, efficiency and unambiguous object interaction during real-time video shooting.
Brane-Bulk Interaction and Holographic Principle
Y. S. Myung,Jin Young Kim
Physics , 2003, DOI: 10.1088/0264-9381/20/11/104
Abstract: We introduce the brane-bulk interaction to discuss a limitation of the cosmological Cardy-Verlinde formula which is useful for the holographic description of brane cosmology. In the presence of the brane-bulk interaction, we cannot find the entropy representation of the first Friedmann equation (the cosmological Cardy-Verlinde formula). In the absence of the interaction, the cosmological Cardy-Verlinde formula is established even for the time-dependent charged AdS background. Hence, if there exists a dynamic exchange of energy between the brane and the bulk (that is, if $\tilde T^t~_y \not=0$), we cannot achieve the cosmological holographic principle on the brane.
Langevin Dynamics of the vortex matter two-stage melting transition in Bi_2Sr_2CaCu_2O$_{8+δ}$ in the presence of straight and of tilted columnar defects
Yadin Y. Goldschmidt,Jin-Tao Liu
Physics , 2007, DOI: 10.1103/PhysRevB.76.174508
Abstract: In this paper we use London Langevin molecular dynamics simulations to investigate the vortex matter melting transition in the highly anisotropic high-temperature superconductor material Bi_2Sr_2CaCu_2O$_{8+\delta}$ in the presence of low concentration of columnar defects (CDs). We reproduce with further details our previous results obtained by using Multilevel Monte Carlo simulations that showed that the melting of the nanocrystalline vortex matter occurs in two stages: a first stage melting into nanoliquid vortex matter and a second stage delocalization transition into a homogeneous liquid. Furthermore, we report on new dynamical measurements in the presence of a current that identifies clearly the irreversibility line and the second stage delocalization transition. In addition to CDs aligned along the c-axis we also simulate the case of tilted CDs which are aligned at an angle with respect to the applied magnetic field. Results for CDs tilted by $45^{\circ}$ with respect to c-axis show that the locations of the melting and delocalization transitions are not affected by the tilt when the ratio of flux lines to CDs remains constant. On the other hand we argue that some dynamical properties and in particular the position of the irreversibility line should be affected.
Observing the Inverse melting of the vortex lattice in Bi$_2$Sr$_2$CaCu$_2$O$_8$ with point defects using Langevin simulations with vortex shaking
Yadin Y. Goldschmidt,Jin-Tao Liu
Physics , 2008,
Abstract: Langevin dynamics simulations of the vortex matter in the highly-anisotropic high-temperature superconductor Bi$_2$Sr$_2$CaCu$_2$O$_8$ were performed. We introduced point defects as a smoothened distribution of a random potential. Both the electromagnetic and Josephson interactions among pancake vortices were included. A special shaking and annealing process was introduced to let the system approach the equilibrium configuration. We are able to see the inverse melting transition from the Bragg-glass to the amorphous vortex glass state, in agreement with recent experiments.
Instability of a two-dimensional extremal black hole
Y. S. Myung,Jin Young Kim
Physics , 1995, DOI: 10.1103/PhysRevD.53.805
Abstract: We consider the perturbation of tachyon about the extremal ground state of a two-dimensional (2D) electrically charged black hole. It is found that the presenting potential to on-coming tachyonic wave takes a double-humped barrier well. This allows an exponentially growing mode with respect to time. This extremal ground state is classically unstable. We conclude that the 2D extremal electrically charged black hole cannot be a candidate for the stable endpoint of the Hawking evaporation.
Radiative correction of the correlator for (0^{++},1$^{-+}$) light hybrid
H. Y. Jin,J. G. K?rner
Physics , 2000, DOI: 10.1103/PhysRevD.64.074002
Abstract: We calculate the radiative corrections to the current-current correlator of the hybrid current $g\bar q(x)\gamma_{\nu}iG_{\mu\nu}^aT^aq(x)$. Based on this new result we use the QCD sum rule approach to estimate lower bounds on the masses of the $J^{PC}$=$1^{-+}$ and $0^{++}$ light hybrids.
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